I think blind is acting as an intensifier here, as faith is often used in a less than absolute sense than "completely trusting."
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UticensisApr 13 '11 at 18:49

9

Yet you can have faith in someone or something based on experience; blind faith is faith based on no experience. If a friend has never revealed secrets in the past, I can have faith that he will not reveal them in the future. To trust someone I don't know at all with secrets would be to act on "blind" faith.
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RobustoApr 13 '11 at 18:58

This has no implications on proof or otherwise. For instance, I have faith in gravity. "Blind faith" is classifying "faith" to mean "faith without evidence or proof." Your friend's quip is mostly a comment on the common usage of "faith" as implying "blind faith" and is intended as a jab at people who take their (albeit blind) faith extremely seriously.

In general terms, discussions of English usage among linguists are not resolved with reference to a dictionary citation. What is important is the sense possessed by a native speaker with reference to a lifetime of familiarity with language. Here's a description of "faith" from wiki: "Faith is in general: the persuasion of the mind that a certain statement is true, belief in and assent to the truth of what is declared by another, based on his or her supposed authority and truthfulness." Ergo, degrees of persuasion and acceptance are inherent in the concept.
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The RavenApr 13 '11 at 19:24

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I was directly responding to the OP's reference of "faith" via a dictionary. This is merely a counter-example. I didn't go into more detail because there are already enough answers talking about the word. The only reason I added any answer is because no one else has pointed out that it can be used to mean "trust" even if most people use it to refer to "blind faith." What I said was correct; other answers have filled in the rest of the topic.
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MrHenApr 13 '11 at 19:40

The differences between faith & blind faith are simple. Faith is believing in something; with or without any information about whatever that something is. Blind-faith... is lacking in some component(s) of information but still continuing to believe in something.

Similar to devotion and blind-devotion.

You can have faith that something will occur knowing that the evidence suggests the outcome... but blind-faith is having faith something will occur with no evidence or conflicting evidence against that outcome.

I have faith that my car will start in the morning, in the sense that I assume it without thinking. But it's not blind faith, because I know roughly what is supposed to happen, and might even be able to fix a simple problem. My faith in a computer, however, is blind: for all I know there may be a small demon trapped inside each one (come to think of it, that would explain a lot...). Note that no knowledge of programming will change this last point: I would need among other things, a soldering iron to convert my faith into a rational belief.

Faith is not blind, but belief (sometimes hope) in something one cannot know: the nature of God, the future outcome of some event, even in the power of scientific discovery to illuminate anything we can observe. People will say they have faith in one of these things.

A person will generally not declare they have blind faith. Others are more likely to attribute it to them. I agree with @Billare it can act as an intensifier, as it might suggest someone's willful ignorance. Depending on context, it might also refer to someone to who believes in something without foundation for the belief itself, or faith for it's own sake.

Faith is something you have hope or belief based on your own experience and from the experience of others. Also by logical thinking.

Blind faith is much stronger, that you hope or believed whatever is happening or will happen even in contrary to your reasoning. A man save up money for his life time work.

Then finally on his old age, he has enough money to start building a small church. Before the church was completely done, the church burns to the ground with faulty electrical wiring.

Why will God alow the church to burn? After all, this is not for the man but to serve and worship God. The man has blind faith: he does not know the reason, but he chooses to believe in the goodness and power of God, and to still worship God.